jtransportstreampacket.cpp
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/***************************************************************************
* Copyright (C) 2005 by Jeff Ferr *
* root@sat *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "Stdafx.h"
#include "jtransportstreampacket.h"
namespace jmpeg {
TransportStreamPacket::TransportStreamPacket()
{
}
TransportStreamPacket::~TransportStreamPacket()
{
}
bool TransportStreamPacket::Check(uint8_t *data, uint32_t size)
{
if (data == NULL) {
// throw jcommon::NullPointerException("Packet is null");
return false;
}
if (size < 188 || size > 188) { // default size of packet from mpeg transport
// throw MpegException("Invalid size of packet");
return false;
}
// TODO:: check crc32
return true;
}
uint32_t TransportStreamPacket::GetSyncByte(uint8_t *packet)
{
return packet[0];
}
uint32_t TransportStreamPacket::GetTransportErrorIndicator(uint8_t *packet)
{
return (packet[1] & 0x80) >> 7;
}
uint32_t TransportStreamPacket::GetPayloadUnitStartIndicator(uint8_t *packet)
{
return (packet[1] & 0x40) >> 6;
}
uint32_t TransportStreamPacket::GetTransportPriority(uint8_t *packet)
{
return (packet[1] & 0x20) >> 5;
}
uint32_t TransportStreamPacket::GetProgramID(uint8_t *packet)
{
return (packet[1] << 8 | packet[2]) & 0x1fff;
}
uint32_t TransportStreamPacket::GetTransportScramblingControl(uint8_t *packet)
{
return (packet[3] & 0xc0) >> 6;
}
uint32_t TransportStreamPacket::GetAdaptationFieldControl(uint8_t *packet)
{
return (packet[3] & 0x30) >> 4;
}
uint32_t TransportStreamPacket::GetContinuityCounter(uint8_t *packet)
{
return packet[3] & 0x0f;
}
bool TransportStreamPacket::HasAdaptationField(uint8_t *packet)
{
return (TransportStreamPacket::GetAdaptationFieldControl(packet) == 0x02 ||
TransportStreamPacket::GetAdaptationFieldControl(packet) == 0x03);
}
uint8_t TransportStreamPacket::GetAdaptationFieldLength(uint8_t *packet)
{
if (TransportStreamPacket::HasAdaptationField(packet) == false) {
return 0;
}
return packet[4] + 1;
}
AdaptationField * TransportStreamPacket::GetAdaptationField(uint8_t *packet)
{
if (TransportStreamPacket::HasAdaptationField(packet) == false) {
return NULL;
}
uint32_t adaptation_field_length = packet[4];
return new AdaptationField(packet+4, adaptation_field_length+1);
}
void TransportStreamPacket::GetPayload(uint8_t *packet, uint8_t *data, uint32_t *size)
{
uint32_t header_size = 4,
control = TransportStreamPacket::GetAdaptationFieldControl(packet);
if (control == 0x00) { // jump the packet, is invalid
header_size = 188;
} else if (control == 0x01) { // just payload, do nothing
;
} else if (control == 0x02) { // only adaptation field
header_size = 188;
} else if (control == 0x03) { // jmp the adaptation field
header_size += packet[4] + 1;
}
if (header_size == 188) {
data = NULL;
size = 0;
} else {
memcpy(data, packet + header_size, 188 - header_size);
*size = 188 - header_size;
}
}
uint8_t TransportStreamPacket::GetPointerField(uint8_t *packet)
{
uint8_t payload[188];
uint32_t size;
TransportStreamPacket::GetPayload(packet, payload, &size);
if (size != 0) {
return (uint8_t)payload[0];
} else {
return (uint8_t)0xff;
}
}
}